Texas Instruments Home Computer 99/4A: Difference between revisions

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(Finished original parts for PSU)
(Main board original parts)
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{{WikipediaInfoAlt|TI-99/4A}}
{{WikipediaInfoAlt|TI-99/4A}}
{{DeviceAlerts}}
{{InfoboxDevice
{{InfoboxDevice
|Title = TI-99/4A
|Title = TI-99/4A
Line 11: Line 10:
|Destructive Entry = No
|Destructive Entry = No
}}
}}
== Known Issues ==
===Symptom or Problem Encountered===
====Causes====
*Description of cause
====Solutions====
*Solution to the problem
== Disassembly Notes ==
Warnings or tips to disassemble the device
== Original Parts ==
== Original Parts ==


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|}
|}


=== Basic PCB Name ===
=== Main Board ===
''Note model numbers and board revisions here''
The main board of the TI-99/4A has very little silkscreening. The only permanent marking on the board are an unrecognizable symbol followed by "''-24  (ET)  246".''
[[File:TI-99-4A Main Board Label.jpg|alt=TI-99-4A Main Board Label|left|thumb|TI-99-4A Main Board Label]]
 
 
 
 
{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
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!Series
!Series
|-
|-
|
|C1, C2, C7
|
|3
|0 µF
|100 µF
|
|16 v
|
|THT
|
|8mm
|
|16mm
|
|Axial
|0 °C
|85 °C
|
|Electrolytic
|
|Nichicon
|
|SE(M)
|-
|C3
|1
|10 µF
|16 v
|THT
|5mm
|12mm
|Axial
|85 °C
|Electrolytic
|Nichicon
|SE(M)
|-
|C4, C5, C6, C8, C9
|4
|22 µF
|16 v
|THT
|6mm
|12mm
|Axial
|85 °C
|Electrolytic
|Nichicon
|SE(M)
|}
|}
The reference designations used for the main board here are not official as there are no designations silkscreened onto the PCB. See the image of the main board for the designations.
[[File:TI-99-4A Main Board.jpg|alt=TI-99-4A Main Board|left|frameless|TI-99-4A Main Board with electrolytic capacitor designations. ]]


==Replacement Parts==
==Replacement Parts==

Revision as of 05:12, 4 January 2024

For more information, see this article's corresponding Wikipedia page: TI-99/4A.
TI-99/4A
Preliminary Information
Release Year 1979
Leak Risk Not Sure
Batteries None
Mounting Technology Through Hole, Sockets
Capacitor Types Aluminum Electrolytic
Destructive Entry No

Original Parts

Power Supply

4A/PS

NO

1049689-2

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C7, C10 2 47 µF 16 v THT 6mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)
C8 1 1000 µF 25 v THT 13mm 26mm Axial 85 °C Electrolytic Nichicon SE(M)
C9 1 3300 µF 35 v THT 22mm 39mm Axial 85 °C Electrolytic Nichicon (M)
C12 1 4.7 µF 50 v THT 6mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)
C15 1 470 µF 12 v THT 12.5mm 24mm 5mm 105 °C Electrolytic Nippon Chemi-Con CERX

Main Board

The main board of the TI-99/4A has very little silkscreening. The only permanent marking on the board are an unrecognizable symbol followed by "-24 (ET) 246".

TI-99-4A Main Board Label
TI-99-4A Main Board Label



Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C1, C2, C7 3 100 µF 16 v THT 8mm 16mm Axial 85 °C Electrolytic Nichicon SE(M)
C3 1 10 µF 16 v THT 5mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)
C4, C5, C6, C8, C9 4 22 µF 16 v THT 6mm 12mm Axial 85 °C Electrolytic Nichicon SE(M)

The reference designations used for the main board here are not official as there are no designations silkscreened onto the PCB. See the image of the main board for the designations.

TI-99-4A Main Board
TI-99-4A Main Board with electrolytic capacitor designations.



Replacement Parts

Basic PCB Name

Capacitors
RefDes Qty Compatible Part Number Order Links
Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

Related Links

References

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